<template>
  <div class="star" :class="starType">
    <span v-for="(itemClass,index) in itemClasses" :class="itemClass" class="star-item"></span>
  </div>
</template>

<script>
  const LENGTH = 5;
  const CLS_ON = 'on';
  const CLS_OFF = 'off';
  const CLS_HALF = 'half';

  export default{
    props: {
      size: {
        type: Number
      },
      score: {
        type: Number
      }
    },
    computed: {
      starType() {
        return 'star-' + this.size;
      },
      itemClasses() {
          let result =[];
          let score = Math.floor(this.score*2)/2;
          let hasDecimal = score % 1 !==0;
          let integer = Math.floor(score);
        for (var i = 0; i < integer; i++) {
          result.push(CLS_ON);
        }
        if(hasDecimal){
            result.push(CLS_HALF)
        }
        while(result.length<LENGTH){
            result.push(CLS_OFF)
        }
        return result
      }
    }
  }
</script>

<style lang="scss">
  .star {
    text-align: center;
    margin-top: 16px;
    /*padding-bottom: 28px;*/

  .star-item{
    display:inline-block;
    background-repeat:no-repeat;
    }
      &.star-48{
      .star-item{
        display: inline-block;
        width: 20px;
        height: 20px;
        background-size:20px 20px;
        margin-right: 22px;
        background-repeat:no-repeat;

      &:last-child{
         margin-right:0;
       }
      &.on{
         background-image: url(star48_on@2x.png);
       }
      &.half{
         background-image: url(star48_half@2x.png);
       }
      &.off{
         background-image: url(star48_off@2x.png);
       }
      }
      }
      &.star-36{
      .star-item{
        width: 15px;
        height: 15px;
        margin-right: 6px;
        background-size:15px 15px;
      &:last-child{
         margin-right:0;
       }
      &.on{
         background-image: url(star36_on@2x.png);
       }
      &.half{
         background-image: url(star36_half@2x.png);
       }
      &.off{
         background-image: url(star36_off@2x.png);
       }
      }
      }
      &.star-24{
      .star-item{
        width: 10px;
        height: 10px;
        margin-right: 10px;
        background-size:10px 10px;
      &:last-child{
         margin-right:0;
       }
      &.on{
         background-image: url(star24_on@2x.png);
       }
      &.half{
         background-image: url(star24_half@2x.png);
       }
      &.off{
         background-image: url(star24_off@2x.png);
       }
      }
      }
  }

</style>
